Repopulate a newer array with values from an older array- php - php

Question

Hello Stack Overflow community,
I am trying to update values from array1 with a newly ordered array2 and output the final array as array2. I have been tying to figure this out for days now but cannot seem to get it. I am new to php as you can most likely tell. Can anyone help me?
Here are the two arrays- 'array1' is first and 'array2' follows:
Array (
[0] => Array
(
[id] => bbb
[hammer] => $1,000
)
[1] => Array
(
[id] => ccc
[hammer] => $678
)
[2] => Array
(
[id] => aaa
[hammer] => $222
)
) Array (
[0] => Array
(
[id] => aaa
[hammer] => GBP 135
)
[1] => Array
(
[id] => bbb
[hammer] => GBP 610
)
[2] => Array
(
[id] => ccc
[hammer] => GBP 413
)
)
Now my code tries to update the newly reordered 'id' values in the second array with the 'hammer' values from the first array. Here is my code:
foreach($array2 as $key => $val) {
$a = $array2[$key]['id'];
$hammer_a = $array2[$key]['hammer'];
foreach($array1 as $key => $val) {
$b = $array1[$key]['id'];
if($a===$b){
$hammer_b = $array1[$key]['hammer'];
$array2[$key]['hammer'] = $hammer_b;
}
}
}
However as this code stands I am left with an undesired result below. I would like 'id' 'aaa' to have its original 'hammer' value of $222 and so on for the other 'id's:
Array
(
[0] => Array
(
[id] => aaa
[hammer] => $1,000
)
[1] => Array
(
[id] => bbb
[hammer] => $678
)
[2] => Array
(
[id] => ccc
[hammer] => $222
)
)
Can anyone please tell me what I am doing wrong?

Answer 1

Change the name of $key and $val in the second loop. They are overriding each other.

Answer 2

Don't use $key in your inner foreach loop. You want the key for array2.

Answer 3

There is also this option, with a lot less code:
$items[0] = array('id'=>'bbb','hammer'=>'$1,000');
$items[1] = array('id'=>'ccc','hammer'=>'$678');
$items[2] = array('id'=>'aaa','hammer'=>'$222');
function cmp($a, $b) {
return strcmp($a['id'], $b['id']);
}
echo '<pre>';
var_dump($items);
usort($items, "cmp");
var_dump($items);
echo '</pre>';